科研之友
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摘要
In this study, two new types of greenhouses have been presented with removable back walls particularly suitable for composite climate (cold days in winter and spring, as well as hot days in summer) as a replacement for conventional single-span polyethylene film covered greenhouse (SPG) in Changshu (120 degrees 58' E, 31 degrees 40' N), Jiangsu province China. One greenhouse had a fully-removable back wall (FRG) and one had a half-removable back wall (HRG). The removable back walls, made of jute fiber boards, were installed in cold days for heat preservation and removed in summer for ventilation. Experimental evaluation of two greenhouses was conducted during spring and summer months by growing a tomato crop and compared with the SPG condition. The results suggest that the air temperatures inside HRG and FRG were above 9.5 degrees C during the spring. The average air temperatures at night (17:00-07:00 h next day) inside two greenhouses were 4.5 degrees C (HRG) and 4.7 degrees C (FRG) higher than SPG. In the summer, as the back wall was removed, with 50% shade net inside the FRG, a drop of 4.3 degrees C of average air temperature during the period of 07:00-18:00 h was observed. It was observed that the micro-climatic parameters like air temperature, soil temperature, and relative humidity remained within desirable range during different stages of crop growth. The tomato yield was 21.7% (HRG) and 23.9% (FRG) higher than SPG. Therefore, two types of greenhouses with removable back walls could be an alternative to the conventional greenhouse in southern Jiangsu.
- 出版日期2015-7
- 单位南京农业大学
